Drawing mechanism for textile machines



April 10, 1956 R. BALMES SOLANAS 2,740,995

DRAWING MECHANISM FOR TEXTILE MACHINES vFiled Aug. 2, 1954 INVENTORRAMON BALMES SOLA NAS United States Patent DRAWING MECHANISM FOR TEXTILEMACHINES Ramon Balmes Solanas, Santa Coloma de Cervello, Spain, assignorto Estirajes Balmes, S. A., Barcelona, Spam Application August 2, 1954,Serial No. 447,187 Claims priority, application Spain August 31, 1953 2Claims. (Cl. 19-130) This invention relates to an improvement in ormodification of the drawing mechanism claimed in my prior specificationSer. No. 384,245, filed October 5, 1953, which describes mechanisms fordrawing textile rovings or slivers, employed both in spinning machinesand in preparation machines, in which the roving or slivers of fibrespasses through between a series of pairs of rollers in succession, andsometimes through other members, which rotate with the fibres.

For the purpose of enabling a high draft of the roving to be effected,it is the practice in these mechanisms to guide the fibres to the finalor delivery rollers by means of members that move with and grip thefibres, preventing the fibres from becoming detached from the roving,but permitting them to move relative to the gripping members in orderthat the drawing may be effected.

In my said prior specification there is employed, for guiding the fibresto the drawing rollers, a small device which is interposed between twoconsecutive pairs of rollers, and which acts as a conductor and presserof the fibres, and at the same time as a uniter of these fibres or acondenser of the roving. This device is constituted by a rigid frame,which carries a pressing roller for the fibres, which bears upon thelower rollers of the two consecutive pairs of rollers of the drawingmechanism. The frame moreover comprises in its lower portion a condenserof the roving and in its upper portion a handle to facilitate theoperation of placing the device in the machine and withdrawing ittherefrom. The roving in passing bears against the lower part of thepressing roller, and passes through the condenser which unites thefibres and gives them cohesion. In one form of construction described inthe said prior specification the pressing roller is slotted along itscentre line, forming an annular groove into which the roving isintroduced, and which acts as a condenser of the fibres, and the frameis open through the lower part, forming an outlet month which becomesprogressively narrower so as to guide the roving to the groove of theroller.

The present invention relates to an improvement in or modification ofthis form of construction described in the abovementioned specificationwhich is particularly applicable to long fibres, and it consistsessentially in replacing the grooved cylinder by two short cylinders orthick discs arranged co-axially and close to one another, which bearupon the lower rollers of the drawing mechanism and revolve by contactwith them, the roving being passed through between the contiguous facesof the two cylinders or discs, which are quite smooth. The frame formson each side a neck or trunnion, which serves as a stationary shaft forthe rotation of the corresponding cylinder, and the two cylinders bearagainst one another with their adjacent smooth faces.

The necessary parts of a drawing mechanism having various pairs ofrollers of the type described, with the improvements forming the subjectof this invention, are illustrated in the accompanying drawings, inwhich Figure 1 represents diagrammatically in transverse section twoadjacent pairs of rollers of the drawing mechanism, between which isarranged the device that drives the rovings;

Figure 2 is a front view of this driving device, with some parts insection;

Figure 3 is a side view, looking from the righthand side of Figure 2;and

Figure 4 indicates the construction of the device, its various partsbeing represented separated from one another.

According to ithis invention there is applied to the drawing mechanism adevice for advancing and uniting the roving, consisting of a frame,which as a whole is denoted in the drawings by the numeral 1, and in theinterior of which are mounted two discs or short cylinders 2 and 3,arranged in axial alignment with one another, and in such a way thatthey are very close to one another at two contiguous end faces, leavingonly just a small clearance.

Each of the discs or cylinders 2 and 3 has on its outer face a circularrecess 4, in which fits a neck or flange 5 provided on the inner face ofthe frame and serving to support the disc or cylinder, permitting it torevolve loosely in full freedom. The other side of each disc is close tothe opposite disc, and in this way, although there are two independentdiscs or cylinders, they remain conveniently supported so as to be ableto revolve with complete freedom while remaining co-axial.

The frame 1 consists of two symmetrical parts 11 and 12, each of whichforms half the frame, and which are united to one another by means of ascrew 13 located in the upper portion. In the central portion each ofthese parts is formed with the aforementioned neck or flange 5, to serveas a support for the corresponding disc or cylinder 2 or 3, and in thelower portion they each have a prolongation, the edge of which has avertical or approximately vertical upper portion 14 and an inclinedlower portion 15. Upon the two parts 11 and 12 being united, thesedownward prolongations form a very wide entrance 16, which progressivelynarrows upwards, until it terminates in a vertical space 17, which islocated in front of the line of separation 6 between the two discs 2 and3. 7

Because of this arrangement of the frame when the device is located inthe machine the roving penetrates by itself into the aperture 16, whichleads it to the space 6 between the two cylinders 2 and 3, so that theroving remains threaded without the necessity for any special care.

The upper portion of the frame forms an upwardly directed handle 7,which facilitates taking hold of the device as a whole in order to placeit in the machine or take it out of the latter.

The two parts 11 and 12 of the frame are shown in the drawing as havingthe necks 5 each provided with a central aperture 8 of relatively largediameter, which extends right through into the recess 4 of theassociated disc. This aperture 8 is not absolutely essential, and mightbe omitted without any serious inconvenience, but it has the advantageof rendering it possible to withdraw easily with the finger any fibriisthat may have been able to work themselves between the neck 5 and therecess of the corresponding cylinder.

This device is placed in the spinning machine as illustrated in Figure1, that is to say, it is interposed between two pairs of rollers 9 and10, in such a way that the cylinders 2 and 3, which project laterallyfrom the frame 1, rest upon the lower rollers of the two pairs. Theframe 1 is supported by the cylinders 2 and 3, and by its lower portionit touches the roller of the front pair 10, thus remaining stationary inits correct position.

When the device has thus been placed in position in ,going.any friction,other than with the two plane faces of the two cylinders that support aswell as compress it. An advancingand condensation of the roving is thusobtained under the best conditions.

. Iclaim:

l. In a drawing mechanism for textile rovings having two consecutivepairs of drawing rollers means comprising a frame, two short cylindersrotatably supported in said frame coaxially with and spaced from eachother havingopposingend facesclose to each other, said frame adapted tofit between said pairs of rollers with the axes of said cylindersparallel to said rollers and with said cylinders supported on the lowerrollers of said pairs of rollers, whereby a roving may be passed betweenthe end faces and having a lateral pressure exerted thereon to condensethe roving and unite the fibers thereof.

2. Means as claimed in claim 1 in which said frame has in the lowerportion thereof an upwardly converging space through which saidrovingmay be introduced between the end faces of said cylinders.

References Cited in the file of this patent UNITED STATES PATENTS2,522,332 Abbott Sept. 12, 1950

1. IN A DRAWING MECHANISM FOR TEXTILE ROVINGS HAVING TWO CONSECUTIVEPAIRS OF DRAWING ROLLERS, MEANS COMPRISING A FRAME. TWO SHORT CYLINDERSROTATABLY SUPPORTED IN SAID FRAME COAXIAILY WITH AND SPACED FROM EACHOTHER HAVING OPPOSING END FACES CLOSE TO EACH OTHER, SAID FRAME ADAPTEDTO FIT BETWEEN SAID PAIRS OF ROLLERS WITH THE AXES OF SAID CYLINDERSPARALLEL TO SAID ROLLERS AND WITH SAID